Patents by Inventor Istvan Szarka

Istvan Szarka has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Hydro-pneumatic operating device actuated with a pneumatic pressure-medium or servo-operation, in particular for motor-vehicle clutches
    Patent number: 4388806
    Abstract: A hydro-pneumatic operating device for motor vehicle clutches permits shifting into second or higher gears without operation of the clutch pedal, by manipulation of an electric switch that actuates an electro-pneumatic valve. A cylinder block 31 is provided that houses a hydraulic working cylinder having a hydraulic piston of a hydro-pneumatic piston, and a pneumatic servo-valve unit whose path control is actuated by an external operating element which cooperates with a pneumatic servo-piston (14) of the hydro-pneumatic piston (20). On an end face of the pneumatic servo-piston (14) opposite a pneumatic servo-chamber (11) there is a supporting surface 19 whose countersurface 118 is formed on the pneumatic servo-piston (20a) of the hydro-pneumatic piston 20. The other side of pneumatic servo-piston 20a confines a blow-off chamber 22. A cylinder section 13 of a pneumatic working chamber 15 enclosed by the hydraulic pneumatic piston 20 and the pneumatic servo-piston 14 has a connection 66 for pressure medium.
    Type: Grant
    Filed: June 24, 1980
    Date of Patent: June 21, 1983
    Assignee: Autoipari Kutato es Fejleszto Vallalat
    Inventors: Istvan Szarka, Janos Urbantsok
  • Controlling and operating device for friction clutches for motor vehicles
    Patent number: 4275804
    Abstract: Controlling and operating device for motor-vehicle friction clutches between the engine and a manual change-speed gear, comprising a manually operated electric switch actuated with the gear-shift lever of the vehicle; a limit switch allowing the device to be rendered inoperative; a release mechanism operated by the clutch pedal; a hydro-pneumatic release unit including two coupled working cylinders of which respective pressure spaces are connected via duct elements to a cylinder of the clutch and via an electro-pneumatic valve to a source of a pressure medium; in its rest position the valve prevents communication between the source and the space of one of the cylinders and provides a different communication from the space of that cylinder to a retarding blow-off unit that forms part of the inventive device and communicates with the free atmosphere, while when the valve is in its operative position it opens the first-named communication and prevents the other; and an electrical circuit that serially connects t
    Type: Grant
    Filed: December 28, 1978
    Date of Patent: June 30, 1981
    Assignee: Autoipari Kutato Intezet
    Inventors: Istvan Szarka, Janos Urbantsok